package com.wugui.datax.rpc.remoting.net.impl.netty_http.client;

import com.wugui.datax.rpc.remoting.invoker.XxlRpcInvokerFactory;
import com.wugui.datax.rpc.remoting.net.common.ConnectClient;
import com.wugui.datax.rpc.remoting.net.common.NettyConstant;
import com.wugui.datax.rpc.remoting.net.params.Beat;
import com.wugui.datax.rpc.remoting.net.params.XxlRpcRequest;
import com.wugui.datax.rpc.serialize.Serializer;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.*;
import io.netty.handler.timeout.IdleStateHandler;
import java.net.URI;
import java.net.URL;
import java.util.concurrent.TimeUnit;
import lombok.extern.slf4j.Slf4j;

/**
 * netty_http
 *
 * @author xuxueli 2015-11-24 22:25:15
 */
@Slf4j
public class NettyHttpConnectClient extends ConnectClient {

  private EventLoopGroup group;
  private Channel channel;

  private Serializer serializer;
  private String address;
  private String host;
  private DefaultFullHttpRequest beatRequest;

  @Override
  public void init(
      String address, final Serializer serializer, final XxlRpcInvokerFactory xxlRpcInvokerFactory)
      throws Exception {
    final NettyHttpConnectClient thisClient = this;

    if (!address.toLowerCase().startsWith("http")) {
      address = "http://" + address; // IP:PORT, need parse to url
    }

    this.address = address;
    URL url = new URL(address);
    this.host = url.getHost();
    int port = url.getPort() > -1 ? url.getPort() : 80;

    this.group = new NioEventLoopGroup();
    Bootstrap bootstrap = new Bootstrap();
    bootstrap
        .group(group)
        .channel(NioSocketChannel.class)
        .handler(
            new ChannelInitializer<SocketChannel>() {
              @Override
              public void initChannel(SocketChannel channel) throws Exception {
                channel
                    .pipeline()
                    .addLast(
                        new IdleStateHandler(
                            0, 0, Beat.BEAT_INTERVAL, TimeUnit.SECONDS)) // beat N, close if fail
                    .addLast(new HttpClientCodec())
                    .addLast(new HttpObjectAggregator(NettyConstant.MAX_LENGTH))
                    .addLast(
                        new NettyHttpClientHandler(xxlRpcInvokerFactory, serializer, thisClient));
              }
            })
        .option(ChannelOption.SO_KEEPALIVE, true)
        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000);
    this.channel = bootstrap.connect(host, port).sync().channel();

    this.serializer = serializer;

    // valid
    if (!isValidate()) {
      close();
      return;
    }

    log.debug(
        ">>>>>>>>>>> xxl-rpc netty client proxy, connect to server success at host:{}, port:{}",
        host,
        port);
  }

  @Override
  public boolean isValidate() {
    if (this.channel != null) {
      return this.channel.isActive();
    }
    return false;
  }

  @Override
  public void close() {
    if (this.channel != null && this.channel.isActive()) {
      this.channel.close(); // if this.channel.isOpen()
    }
    if (this.group != null && !this.group.isShutdown()) {
      this.group.shutdownGracefully();
    }
    log.debug(">>>>>>>>>>> xxl-rpc netty client close.");
  }

  @Override
  public void send(XxlRpcRequest xxlRpcRequest) throws Exception {
    byte[] requestBytes = serializer.serialize(xxlRpcRequest);

    DefaultFullHttpRequest request =
        new DefaultFullHttpRequest(
            HttpVersion.HTTP_1_1,
            HttpMethod.POST,
            new URI(address).getRawPath(),
            Unpooled.wrappedBuffer(requestBytes));
    request.headers().set(HttpHeaderNames.HOST, host);
    request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
    request.headers().set(HttpHeaderNames.CONTENT_LENGTH, request.content().readableBytes());

    this.channel.writeAndFlush(request).sync();
  }
}
